package com.weeho.servlet.upload;


import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import net.sf.json.JSONObject;



/**
 * 文件上传实例
 * @author waming
 *
 */
public class UploadPhotoServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
	
    // 上传文件存储目录
    private static final String UPLOAD_DIRECTORY = "upload";
 
    // 上传配置
    private static final int MEMORY_THRESHOLD   = 1024 * 1024 * 3;  // 3MB
    private static final int MAX_FILE_SIZE      = 1024 * 1024 * 40; // 40MB
    private static final int MAX_REQUEST_SIZE   = 1024 * 1024 * 50; // 50MB
    public UploadPhotoServlet() {
        super();
    }
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	@SuppressWarnings("unchecked")
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException  {
		 if (!ServletFileUpload.isMultipartContent(request)) {
	            // 如果不是则停止
	            PrintWriter writer = response.getWriter();
	            writer.println("Error: 表单必须包含 enctype=multipart/form-data");
	            writer.flush();
	            return;
	        }
	 
	        // 配置上传参数
	        DiskFileItemFactory factory = new DiskFileItemFactory();
	        // 设置内存临界值 - 超过后将产生临时文件并存储于临时目录中
	        factory.setSizeThreshold(MEMORY_THRESHOLD);
	        // 设置临时存储目录
	        factory.setRepository(new File(System.getProperty("java.io.tmpdir")));
	 
	        ServletFileUpload upload = new ServletFileUpload(factory);
	         
	        // 设置最大文件上传值
	        upload.setFileSizeMax(MAX_FILE_SIZE);
	         
	        // 设置最大请求值 (包含文件和表单数据)
	        upload.setSizeMax(MAX_REQUEST_SIZE);

	        // 中文处理
	        upload.setHeaderEncoding("UTF-8"); 

	        // 构造临时路径来存储上传的文件
	        // 这个路径相对当前应用的目录
	        String uploadPath = request.getServletContext().getRealPath("./") + File.separator + UPLOAD_DIRECTORY;
	       
	         
	        // 如果目录不存在则创建
	        File uploadDir = new File(uploadPath);
	        if (!uploadDir.exists()) {
	            uploadDir.mkdir();
	        }
	 
	        try {
	            // 解析请求的内容提取文件数据
	            @SuppressWarnings("unchecked")
	            List<FileItem> formItems = upload.parseRequest(request);
	 
	            if (formItems != null && formItems.size() > 0) {
	                // 迭代表单数据
	                for (FileItem item : formItems) {
	                    // 处理不在表单中的字段
	                    if (!item.isFormField()) {
	                        String fileName = new File(item.getName()).getName();
	                        String filePath = uploadPath + File.separator + fileName;
	                        File storeFile = new File(filePath);
	                        // 在控制台输出文件的上传路径
	                        System.out.println(filePath);
	                        // 保存文件到硬盘
	                        JSONObject jsonObject=new JSONObject() ; 
	                   	    jsonObject.put("data", JSONObject.fromObject(filePath));  
	                	   	 //jsonObject.JSONObject.fromObject(jsonObject.toString());  
	                	   	 System.out.println("----------------------------------"+jsonObject.toString());
//	                	   	 out.println(jsonObject.toString());
	                        item.write(storeFile);
	                        request.setAttribute("message",
	                            "文件上传成功!");
	                    }
	                }
	            }
	        } catch (Exception ex) {
	            request.setAttribute("message",
	                    "错误信息: " + ex.getMessage());
	        }

	}
	
	/**
	 * Ajax辅助方法 获取 PrintWriter
	 * @return
	 * @throws IOException 
	 * @throws IOException 
	 * request.setCharacterEncoding("utf-8");
		response.setContentType("text/html; charset=utf-8");
	 */
	private PrintWriter encodehead(HttpServletRequest request,HttpServletResponse response) throws IOException{
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html; charset=utf-8");
		return response.getWriter();
	}
	public String rename(FileItem file) {
		String body = "";
		String ext = "";
		Date date = new Date();
		int pot = file.getName().lastIndexOf(".");
		if (pot != -1) {
			body = date.getTime() + "";
			ext = file.getName().substring(pot);
		} else {
			body = (new Date()).getTime() + "";
			ext = "";
		}
		String newName = body + ext;
		return newName;
	}
}
